Ive had a few lymph nodes swollen for 4 years now, slowly grew from 2cm to 3.5cm long. ultrasound shows normal characteristics. docs cant explain it, fna was clear and doctors are saying its fine. but cant fna miss lymphoma?

Several reasons why lymph nodes may become swollen for an extended period of time. While lymphoma is a possibility, it is important to consider other potential causes as well. One explanation for persistent enlargement is a chronic infection. Certain infections, such as tuberculosis or HIV, can cause lymph nodes to remain swollen asymptomatic for years.